7 Year old, possibly pregnant Bengal cat.?

I adopted an older Bengal queen who was, as I was told, out of commission for making kittens, that's why she was being adopted out, I received her from a breeder about a month or so ago. About two days ago my roommate and myself began to notice her sides bulging in a very pregnant manner and she was being extremely vocal. The breeder had told us that she still has heat cycles, that's what we umed was occurring. However, she has also had discharge, constant cleaning of her lady parts, pacing, what appears to be nesting, there was a large amount of clearish liquid at one point and so forth. This began yesterday at around five o'clock in the evening. It is now seven o'clock in the morning, the next day and although these behaviors are still occurring they seemed to have calmed down, so I am not so sure that she is in labor. I plan on taking her to the vet when I get home from work if nothing else has changed, I was just looking for any advice or suggestions to what is happening, Is it possible that she is in labor and the hard labor has just not begun yet? Any information would be helpful! Thanks.